Skiving-machine



A. LATHAM.

SKlVlNG MACHINE.

APPLICATION FILED FEB. 12. I918.

Patented June 1, 1920.

@umr so I 51 :A' EES mam Peering,

ALBERT: LArrremfw 'i'iiv'nnnnayrAssiieniisnrrs;nssreivon To UNITED sHoEMACHINERY conPonATIoN; or rArERso'N, NEW" JERSEY, A CORPORATION or NEWJERSEY.

"sKrvrNG-MiieHmE.

-App1icati0n' filed February 12,4918. SeriaIN-o. 216,735.

To all whom it may concern:

' Be it known that I, ALBERT; LATHAM, a citizen of the-United States,residing at Beverly, in the county of Essex and State of 'Massachusetts,have invented certain new and useful Improvements in Skiving-Nlarchines; and I do herebydeclare the following'tobea'full, clear,--;andexact description of the invention, such as will-enable others skilledin the art -to which'it appertains to -make-and use-the same. V

V The present. invention relates to skiving machines and 'moreparticularly to the knives and cooperating mechanism' employed in'suchmachines.

The invention is more particularly ap- -plied-to tubular skiving knivesof the type in which a-thinfiexible knife blade is rigidly clamped toa'blade. holder. The knives are rotated athigh speed and it isessentialthat the knife edge shall not deviate in the slightest degreefrom the true circle of rota- 7 tion of the knife. In order to securethis result the knife blade must be rigidly clamped to a holder having atrue bladeen- Hgaging surface and the supporting shaft upon which theholder is mounted must be accurately'supported in order that it shallpermit a free rotation of the shaft without .whippin'g or vibrating it.

()ne object of the present invention, therefore, 'is to reorganize andimprove the construction of-skivlng kIllVBS- of this 'type' in orderthatgall portions of'the cutting edgeof the knifeshall be concentricwith the axis of rotation. v

A further object of the invention is to improvethemechanism for clampingthe knife :blade to the holder and adjusting the knife blade relativetOthe holder insuch' a manner that these operations are l greatlyfacilitated and the liability of injury to the operator is-'--eliminated.

.Figure'i-rep resents-a longitudinal sectionin VViththese objects inview the several features of the invention consist in certain novelfeatures of construction, combinations and-arrangements of partshereinafter 'described and claimed,' the advantages of whichwill be"obvious to those skilledfin the art from thefollowing:description.

Inthe: accompanying draw ngs lllustrating the preferred form of theinvention,

elevation of the skiving knife and cooperat- 1ng,parts;'F1g. 2 isadetail illustrating a Patented June l, 1920.

portion of the front of the knife withcertain and clamping the knife.

. The knife shown inthe illustrated embodiment ofthe inventioncomprisesathin flexible blade 10=adapted to be clamped within a blade'holder 12which has a blade engaging surface shaped to causethe knife blade toconform to. a true cylinder when clamped in position. 'The'holder isprovided with a base portion 11 which is threaded upon the flange 13formed upon the I outer. end of. a knife rearedge upon a carrierring 14which is provided withan annular groove 15, engaged by projections 16struckrup from the surface 1 of the blade, as shown clearly in Fig; 1.f-The blade-10 is clamped rigidly to the holder '12 shaft 1 7 The blade10 is'supported at itsv adja'cent'the cutting edge of the bladeby' aring 18 having .an inner tapered face 19 which is engaged *by aclainping plate 20 when'the latter is moved axially of .the

knife. --The'expansion of the ring 18 is pertudinal slots 21extendingrearwardly from ;-theedge of the ring; as shown in Fig, 1. The bladecarrier 14 is traversed inand out 'to :properly adjust the blade througha;

threaded connection 22 withthe clamping ring 18 which is secured through.fast'enings 23'to theouter'endof afrotary-sleeve 25 received, withinthe hollow knife shaft 17.

During the rotation ofthe ring 18 to: adjust the blade the carrier ring14: is prevented from rotating by engagement with 'the sur- "face of thebladehol-der12 and to insurethat {this frictional engagement shall besufiicient to retain thering in position the latter is mitted bytheprovision of aseries of-longipreferably split, as indicatedat 28; andis V sprung into the holder. The clamping plate 120 is secured'to theouter end of a rod3O which is *splined to the hollow sleevef25 site ends:received in lengthwise slots 32 -formed in the sleeve to permit the rodto movelengthwise of the sleeve without rotating relative thereto.

through atransversezpin 31 havingits oppoadjustmentof the knife bladeare controlled blade to the desired point and insures the rigid clampingof the blade to the holder in whatever position the blade maybe located.The clamping rod extends within the front end of the sleeve 25' adistance sufficient to afford a proper bearing for the rod '7 and isprovided at its inner-end with a threadedbore which receives thecorrespondingly threaded end of a stem 36 which extends completelythrough the shaft and 'has keyed upon its opposite end a hand wheel 37.The sleeve '25, to which the adjustingring is secured, also extendscompletely through the hollow knife shaft and has a' hand wheel 39secured thereto. With this constructiona rotation of the hand wheel 39causes a like rotation of the ring "1,8 and traverses the blade in orout of the holder, whereas a rotation of the hand wheel 37 moves the rod30 and clamping-plate 2O lengthwise of the knife to expand or contractthe clamping ring 18. o The knife blade is ejected from within theholder by moving the sleeve 25 and stem 36'length'wise of the knifeshaft and in order to permit this I lengthwise movement of the memberswhen desired, and at the same time normally preserve the'properoperative relation'of the several parts, a spacing collar 40 is made intwo parts, one of which is indicated at 41, and is interposedbetween thehand wheel 39 and drive pulley'42keyed to the knife shaft .17." Thiscollar is provided with an overhangin'g flange 43 which receives asmaller collar 44 having an inner-tapered face "45 adapted'to engagewitha correspondingly tapered face 46 formed on an annularfiange "47.The operating collar44has a'plurality of pins 49 which pass. looselythrough holes 'formed'in the hand wheel'39 into a position where theirouter ends may be engaged by a face of the hand wheel'37. When the handwheel 37 is rotated in a'direction to'clamp the box against rotationwith the shaft but the'knife blade to the holder, both the clampmgplateand the handwheel are drawn to- .ward one another. The hand wheelthen .Inoves the collar 44 through the pins 49 un- 'til the tapered face45 engages with the corresponding face of the flange 47 to clamp the twoparts of the collar together. A con tinuedrotationof the hand wheel thenmoves 7 shaft 171and sleeve 25 together. When it is desired to removethe knife blade from the holder the hand wheel 37 is slacked olfsufficintlyto permit the collar 40 tobe 'disengaged from the recess51,after which the two parts of the collar may beseparated and removed fromthe shaft. After the removal 3 of the. collar the hand wheels 37 and 39may when the stem 36 is threaded into the rod 30 to tighten the clamp,the thrust of the stem is transmitted through the pins 49 and collar 40to the pulley 42, which is rigidly secured to the knife shaft:

The high speed at which these knives are plates the provision ofself-aliningbearings which permit the shaft to be rotated at high 1speeds without chattering or vibrating. The

knife shaft-l7 is supported at opposite ends in journal boxes 60 and 61,each of which is provided with a rounded annular bead'63 midway betweenits ends which is of slightly greater diameter than the outer diameterof the box. Each journal box is re ceived within an opening'65 formed inthe frame 66 of'the machine and of a size to cause the bead 63 to fitclosely therein. With this construction a slight swiveling movement ofthe box within the opening 65 is permitted. The annular bead formed uponeach box is engaged by the end of a plug 67 threaded into an openingformed in the'frame and having an inner cup-shaped end adapted to fitthe bead. The-plug is provided with a lengthwise bore'68 into thethreaded stud 67 is loosened slightly the bearing boxes are permitted toaline them-" selves accurately with the shaft after which each box isrigidly secured in alined posi tionby tightening the stud. The neck 70,projecting within the opening 71, maintains as the opening is slightlylarger than the neck in a direction lengthwise of the box,

the necessary alining movements of the j our- 1191 box are permitted.Each box is provided with lubricating grooves 73 which";

communicate with a duct 75 formed in the pin6'9 and supplied withlubricant in any suitable rnanner. The knife shaft is maintainedinpositionthrough the provision of an annular flange 77 and a thrustcollar 78' disposed upon opposite "sides of the journal box 6(). Thethrust collar is preferably keyed to the shaft-and ispreventedfrommoving longitudinally through a lock nut 79 threaded to the shaft behindthe thrust collar.

While it is preferred to employ the specific construction andarrangement of parts shown and described, it will be understood thatthis construction and arrangement is not essential except so far asspecified in the claims, and may be changed or modified withoutdeparting from the broader features of the invention.

The invention having been described, what is claimed is:

1. A skiving machine comprising a hollow knife shaft, a holder securedto one end of the shaft, a knife blade, and means for clamping the bladeto the holder including a clamping disk, a stem secured to the disk andprojecting into the front end of the knife shaft, an operating rodthreadedly connected to the stem and projecting through the knife shaftto the rear end, means for rotating the knife shaft, and an actuatingmember secured to the rear end of the rod for rotating the latter.

I 2. A skiving machine comprising a knife holder, a clamping ring havingan inner tapered face, a blade carrier threadedlyconnected to theperiphery of the clamping ring, a knife blade secured to the carrier, aclamping disk having a tapered face corresponding to the tapered faceupon the clamping ring, and means for moving the disk axially of thering to clamp the blade to the holder.

3. A skiving machine comprising a hollow knife shaft, a knife holdersecured to one end of the shaft, a knife blade, a drive pulley securedto the opposite end of the shaft, a

blade adjusting rod and a blade clamping V the rod, and detachableconnections for normally preventing outward movement of the two rods tomaintain the clamping ring and disk within the holder.

4. A skiving machine comprising a hol low knife shaft, a drive pulleysecured to the knife shaft, an operating rod received" between the handwheel and pulley to normally maintain a predetermined spaced relationbetween the two.

5. 'A skiving machine comprising a hollow knife shaft, an operating rodreceived with in the knife shaft, and detachable means for clamping therod and shaft together designed to permit a relative axial movement ofthe two when removed.

6. A skiving machine comprising a hollow shaft, an operating rodreceived within ing the collar to lock the shaft and rod together and topreserve a predetermined axial relation between the two designed toprevent removal of the collar when in clamping position.

8. A skiving machine comprising a hollow knife shaft, a knife holdersecured to' one end of the shaft, a knife blade, means for adjusting theblade relative to the holder, means for clamping the blade to theholder, an adjusting rod and a clamping rod extending through the knifewshaft, means for actuating the rods to operate the clamping andadjusting mechanisms, and detachable means for permitting the completeejectment from the knife holder of the knifeblade together with theclamping and adjusting mechanisms. J

9. A skiving machine comprising a hollow knife shaft, a knife holdersecured to one end of the shaft, a knife blade, means for clamping theknife blade to the holder, a clamping rod extending through the shaftand threadedly connected with the clamping means, an actuating membersecured to the opposite end of the rod and a spacing collar interposedbetween the actuating member and the end of the "knife shaft and throughwhichthe thrust of the rod is transmitted when actuated to move theclamping mem ber inwardly to clamping position.

ALBERT LATHAM.

